Abstract: The MPPT algorithm might fall into the local optimum in curvilinear optimization of the multi-peak P-U curve under partial shading.Because of this situation, the tracking speed and accuracy could not achieve a balance. The tracking vibration is large, which causes the loss of photovoltaic energy. This paper proposed a photovoltaic MPPT control method based on switched inductor floating interleaved Boost and the hybrid HS algorithm. In addition, it introduced the random convergence factor ω in the global search process of the harmony search (HS) algorithm and coordinated with the P&O algorithm in the local search. Besides, it used the conduction characteristics of the interleaved Boost to reduce the ripple in the power generation process, decrease the output oscillation, and add the switching inductance to increase the voltage gain. By doing this, the algorithm could reach the maximum power point faster for searching. This research constructed a simulation model in MATLAB/Simulink. The experimental comparison shows that the proposed control method has excellent response speed. Moreover, it could quickly track the global maximum power point before and after the light mutation. It improves the convergence speed and tracking accuracy, and the stability is good.

    Key words: partial shading; maximun power point tracking; harmony search algorithm; floating interleaved; switched inductor